Display module

• US 20020140645A1
• Filed: 03/25/2002
• Published: 10/03/2002
• Est. Priority Date: 03/28/2001
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Mikami, Yoshiro, Ouchi, Takayuki, Kaneko, Yoshiyuki, Sato, Toshihiro
• Granted Patent: US 6,947,019 B2
• Time in Patent Office: Days
• US Class Current: 345/82
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2300/0876 Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
• CPC Class Codes: G09G 2310/0248 Precharge or discharge of column electrodes before or after applying exact column voltages
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2310/0262 The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

Abstract

This display module performs a high quality display by preventing the effect resulting from a residual charge of a data signal in the previous scanning remaining in a capacitor of a pixel circuit.

The display module is provided with the pixel circuit having an active element that selects a pixel by a horizontal scanning signal supplied from a scanning line GL every intersection unit of multiple scanning lines GLs arranged in a matrix within a display region AR on a substrate SUB, a data holding element that holds a data signal supplied from the data line by the turn-on of this active element, and an organic light emitting diode OLED that emits light by the current supplied from a current supply line CSL in accordance with the data signal held in the data holding element, and a reset circuit RST that recovers at least either a capacitor CPR or a data line DL of the pixel circuit to an initial condition is provided before data for the pixel that corresponds to the next scanning line is sent to the data line after the scanning of the scanning line before one is finished.

Claims

1. A display module, comprising:

multiple scanning lines arranged in a matrix within a display region on a substrate and a pixel every intersection unit of multiple data lines that intersect said multiple scanning lines, and a current supply line that supplies display current to said pixel, wherein

said pixel comprises a pixel circuit having an active element selected by a scanning signal that is supplied from said scanning line, a data holding element that holds a data signal supplied from said data line by the turn-on of said active element, and an emitting device that emits light by the current supplied from said current supply line in accordance with the data signal held by said data holding element;

said emitting device has a first electrode layer driven by said active element, an organic light emitting layer formed on said first electrode layer, and a second electrode layer formed on said organic light emitting layer; and

a reset circuit that recovers said data holding element to an initial condition before data is sent to said data line after the scanning of said scanning line before one is finished is provided.

2. The display module according to claim 1, wherein said reset circuit recovers said data holding element and said data line to an initial condition.

3. A display module, comprising:

multiple scanning lines arranged in a matrix within a display region on a substrate and a pixel every intersection unit of multiple data lines that intersect the multiple scanning lines, and a current supply line that supplies display current to said pixel, wherein

said pixel comprises with a pixel circuit having an active element selected by a scanning signal that is supplied from said scanning line, a data holding element that holds a data signal supplied from said data line by the turn-on of said active element, and an emitting device that emits light by the current supplied from said current supply line in accordance with the data signal held by said data holding element;

said emitting device has a first electrode layer driven by said active element, an organic light emitting layer formed on said first electrode layer, and a second electrode layer formed on said organic light emitting layer; and

a reset circuit that recovers said data line to an initial condition before data is sent to said data line after the scanning of said scanning line before one is finished is provided.

4. The display module according to claim 3, wherein said reset circuit recovers said data holding element to an initial condition before data is sent to said data line after the scanning of the next said scanning line one is started.

5. The display module according to claim 3, wherein

recovery to said initial condition is performed every scanning of said scanning line.

6. The display module according to claim 3, wherein said reset circuit is provided in the rear stage of said data driving circuit and the front stage of said data line.

7. The display module according to claim 3, said reset circuit is provided at the termination position of said data line.

8. The display module according to claim 3, wherein said scanning driving circuit and said data driving circuit are arranged at the outside of said display region on said substrate and the adjacent two sides of said substrate, respectively.